<template>
  <div>
    <div style="padding: 10px 0">
      <el-input
          style="width: 200px"
          placeholder="请输入名称"
          suffix-icon="el-icon-search"
          v-model="name"
      ></el-input>
      <el-button class="ml-5" type="primary" @click="load">搜索</el-button>
      <el-button type="warning" @click="reset">重置</el-button>
    </div>
    <div style="margin: 10px 0">
      <el-button type="primary" @click="handleAdd">新增<i
          class="el-icon-circle-plus-outline"></i></el-button>

      <el-popconfirm
          class="ml-5"
          confirm-button-text="确定"
          cancel-button-text="我再想想"
          icon="el-icon-info"
          icon-color="red"
          title="您确定删除吗？"
          @confirm="delBatch"
      >
        <el-button type="danger" slot="reference"
        >批量删除<i class="el-icon-remove-outline"></i
        ></el-button>
      </el-popconfirm>
    </div>

    <el-table
        :data="tableData"
        border
        stripe
        :header-cell-class-name="headerBg"
        @selection-change="handleSelectionChange"
    >
      <!-- @selection-change="handleSelectionChange"获取勾选的数据-->

      <el-table-column type="selection" width="55"></el-table-column>
      <el-table-column prop="id" label="id" width="80"></el-table-column>
      <el-table-column prop="name" label="课程名称"></el-table-column>
      <el-table-column prop="score" label="学分"></el-table-column>
      <el-table-column prop="times" label="课时"></el-table-column>
      <el-table-column prop="teacher" label="上课老师"></el-table-column>

      <el-table-column label="下载">
        <template slot-scope="scope">
          <el-button type="primary" @click="download(scope.row.url)"
          >下载
          </el-button
          >
        </template>
      </el-table-column>

      <el-table-column label="启用">
        <template slot-scope="scope">
          <el-switch
              v-model="scope.row.state"
              active-color="#13ce66"
              inactive-color="#ccc"
              @change="changeEnable(scope.row)"
          ></el-switch>
        </template>
      </el-table-column>

      <el-table-column label="操作" width="280" align="center">
        <template slot-scope="scope">
          <el-button type="primary" @click="selectCourse(scope.row.id)" :disabled="!scope.row.state">选课</el-button>
          <el-button type="success" @click="handleEdit(scope.row)"> 编辑<i class="el-icon-edit"></i></el-button>

          <el-popconfirm
              class="ml-5"
              confirm-button-text="确定"
              cancel-button-text="我再想想"
              icon="el-icon-info"
              icon-color="red"
              title="您确定删除吗？"
              @confirm="del(scope.row.id)"
          >
            <el-button type="danger" slot="reference" >删除<i class="el-icon-remove-outline"></i></el-button>
          </el-popconfirm>

        </template>
      </el-table-column>
    </el-table>

    <div style="padding: 10px 0">
      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="pageNum"
          :page-sizes="[2, 5, 10, 20]"
          :page-size="pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total"
      >
      </el-pagination>
    </div>
    <el-dialog title="课程信息" :visible.sync="dialogFormVisible" width="30%">
      <el-form label-width="80px" size="small">
        <el-form-item label="名称">
          <el-input v-model="form.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="学分">
          <el-input v-model="form.score" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="课时">
          <el-input v-model="form.times" autocomplete="off"></el-input>
        </el-form-item>

        <el-form-item label="老师">
          <el-select clearable v-model="form.teacherId" placeholder="请选择" style="width: 100%">
            <el-option v-for="item in teachers" :key="item.id" :label="item.nickname" :value="item.id">
            </el-option>
          </el-select>

        </el-form-item>

      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>
<script>

export default {
  name: "course",
  data() {
    return {
      tableData: [],
      name: "",
      multipleSelection: [],
      headerBg: "headerBg",
      pageNum: 1,
      pageSize: 10,
      total: 0,
      dialogFormVisible: false,
      form: {},
      teachers: [],
      user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {},

    };
  },

  created() {
    this.load();
  },

  methods: {
    save() {
      this.request.post("/course", this.form).then((res) => {
        if (res.code === '200') {
          this.$message.success("保存成功");
          this.dialogFormVisible = false;
          this.load();
        } else {
          this.$message.error("保存失败");
        }
      });
    },
    selectCourse(courseId){
      this.request.post('/course/studentCourse/' + courseId + "/" + this.user.id).then(res => {
        if(res.code === "200"){
          this.$message.success("选课成功")
        }else {
          this.$message.error(res.msg)

        }
      })
    },
    load() {
      //加载2条数据
      this.request
          .get("/course/page", {
            params: {
              pageNum: this.pageNum,
              pageSize: this.pageSize,
              name: this.name,
            },
          })
          .then((res) => {
            console.log(res);
            this.tableData = res.data.records;
            this.total = res.data.total;
          });

      this.request.get("/user/role/ROLE_ADMIN").then((res) => {
        this.teachers = res.data
      });
    },

    changeEnable(row) {
      this.request.post("/course/update", row).then((res) => {
        if (res.code === "200") {
          this.$message.success("操作成功");
        }
      });
    },

    del(id) {
      this.request.delete("/course/" + id).then((res) => {
        if (res.code === "200") {
          this.$message.success("删除成功");
          this.load();
        } else {
          this.$message.error("删除失败");
        }
      });
    },
    handleSelectionChange(val) {
      // console.log(val)
      this.multipleSelection = val;
    },

    delBatch() {
      let ids = this.multipleSelection.map((v) => v.id); //[{},{},{}] => [1,2,3]
      console.log(ids);
      this.request.post("/course/del/batch/", ids).then((res) => {
        if (res.code === "200") {
          this.$message.success("批量删除成功");
          this.load();
        } else {
          this.$message.error("删除失败");
        }
      });
    },
    handleAdd() {
      this.dialogFormVisible = true;
      this.form = {};
    },
    //重置
    reset() {
      this.name = "";
      this.load();
    },
    handleEdit(row) {
      console.log("row=", row);
      this.form = row;
      this.dialogFormVisible = true;
    },
    handleSizeChange(pageSize) {
      console.log(pageSize);
      this.pageSize = pageSize;
      this.load();
    },
    handleCurrentChange(pageNum) {
      console.log(pageNum);
      this.pageNum = pageNum;
      this.load();
    },
    //上传文件
    handleFileUploadSucces(res) {
      console.log(res);
      this.load();
    },

    // 下载
    download(url) {
      window.open(url);
    },
  },
};
</script>

<style scoped>
.headerBg {
  background-color: #eee !important;
}
</style>